The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1992
Filed:
Dec. 18, 1990
Tsuguo Sato, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A tape transport apparatus is comprised of a friction type capstan servo block having a friction type capstan driven by a capstan motor controlled by a capastan servo circuit in response to a control signal for determining a velocity of the capstan and a pulse signal generated in response to a rotation of the capstan motor, a reel servo block having a supply reel and a take-up reel driven by a supply and take-up reel motor controlled by a supply reel and take-up reel control circuit respectively, first and second tape tension detectors for detecting tape tension of the tape locating between the capstan and supply reel and between the capstan and take-up reel respectively, a control voltage generator for generating a control voltage, a tape tension control data generating circuit having a memory, the memory having a plurality of back tension characteristics data each of which is changed in response to the pulse signal so that the back tension of the supply reel motor is controlled in response to an outlet signal of the first tape tension detector and the velocity of the capstan motor and that a tape tension by the take-up reel is controlled in response to the control voltage and an output of the second tape tension detector, and a memory control circuit having a current detector for detecting a drive current of the capstan motor and a circuit for selecting one of the plurality of back tension characteristics data in response to an output signal of the current detector so that tape tensions at an entrance position and at an exit position of the friction capstan can be controlled to become approxiamtely the same regardless of the change of atmospheric conditions.